微结构特性对饱和黄土动残余变形的影响研究

王谦; 王平; 王峻; 钟秀梅; 马海萍; 冯敏杰

doi:10.11779/CJGE2015S2028

微结构特性对饱和黄土动残余变形的影响研究 English Version

王谦^{1, 2, 3},
王平^{1, 3},
王峻^{1, 3},
钟秀梅^{1, 3},
马海萍³,
冯敏杰^{1, 3}

1. 中国地震局黄土地震工程重点实验室,甘肃兰州 730000; 2. 兰州大学土木工程与力学学院,甘肃兰州 730000; 3. 中国地震局兰州地震研究所,甘肃兰州 730000

基金项目: 国家自然科学基金项目（51408567）; 甘肃省科技计划项目; （1308RJZA153）; 黄土地震工程重点实验室基金项目（KLLEE-12-003）

详细信息

作者简介:
王谦(1985- ),男,甘肃临夏人,助理研究员,主要从事黄土动力学与地震工程理论与试验研究工作。

计量
- 文章访问数: 0209
- HTML全文浏览量: 0
- PDF下载量: 0323
出版历程
- 收稿日期: 2015-03-25
- 发布日期: 2015-07-24

Effect of microstructure properties on of dynamic residual deformation behavior of saturated loess

WANG Qian^{1, 2, 3},
WANG Ping^{1, 3},
WANG Jun^{1, 3},
ZHONG Xiu-mei^{1, 3},
MA Hai-ping³,
FENG Min-jie^{1, 3}

1. Key Laboratory of Loess Earthquake Engineering, CEA, Lanzhou 730000, China; 2. Schools of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China; 3. Lanzhou Institute of Seismology, CEA, Lanzhou 730000, China

摘要

摘要: 通过对黄土高原不同微结构分区的黄土进行微结构电镜扫描试验和饱和状态下的动三轴液化试验,以及相同物性状态下兰州原状与重塑黄土液化的对比试验,得出了饱和黄土结构性对抗液化强度的影响规律,定性定量分析了微结构类型对饱和黄土动残余变形特征的影响关系,并通过分析不同地区黄土的动应力-动残余应变,得出了不同微结构特性黄土动残余变形发展的机制。研究结果表明：饱和黄土的抗液化强度与其结构性有关,重塑过程中由于颗粒重组和颗粒间胶结作用的减弱,导致土体的抗液化强度降低;饱和黄土液化时动残余变形随着振次增加呈指数关系增加,拟合参数主要受控于黄土的密度和塑性指数,动残余变形的增长与微结构特性关系密切,结构强度越高的黄土动残余变形增长越缓慢;不同微结构特性的黄土液化时动残余应变发展机理不同,胶结性较弱的黄土动残余变形可划分为黏弹塑性和塑性阶段,胶结性较强的黄土液化时依次产生黏弹塑性、黏塑性和塑性变形。
- 黄土 /
- 液化 /
- 微结构 /
- 变形特征
Abstract: Based on the SEM tests and dynamic triaxial tests on the loess with different microstructures from the Loess Plateau region and the liquefaction tests on undisturbed and disturbed Lanzhou loess with the same property state, the influence rules of structural properties of saturated loess on liquefaction strength are obtained. The relationship between microstructural types and the dynamic residual deformation behavior of saturated loess are qualitatively and quantitatively analyzed. Moreover, the development mechanisms of the dynamic residual deformation of the loess with different microstructures are obtained through analysis of the dynamic stress-dynamic residual strain of the loess in different regions. The results show that the liquefaction strength of saturated loess relates to the micro structure. The liquefaction strength of the soil decreases during the disturbed process because the particle reorganization and the cementation are weakened. The dynamic residual deformation of the saturated loess exponentially increases with the increase of vibration times, and the fitting parameters are mainly controlled by the density and plasticity index of the loess. The increase of dynamic residual deformation closely relates to the microstructural properties, the higher the structural strength, the slower growth the dynamic residual deformation of the loess. The development mechanisms of dynamic residual deformation are different for the loess with different microstructural properties. The dynamic residual deformation of weak cementation loess can be divided into visco-elastoplastic and plastic stages. However, the dynamic residual deformation of stronger cemented loess can be divided into visco-elastoplastic, visco-plasticity and plastic stages successively during liquefaction.
- loess /
- liquefaction /
- micro structure /
- deformation behavior

HTML全文

参考文献(13)

[1]	刘汉龙. 土动力学与土工抗震研究进展综述[J]. 土木工程学报, 2012, 45(4): 1-17. (LIU Han-long. A review of recent advances in soil dynamics and geotechnical earthquake engineering[J]. China Civil Engineering Journal, 2012, 45(4): 1-17. ( in Chinese))
[2]	胡再强, 沈珠江, 谢定义.非饱和黄土的结构性研究[J]. 岩石力学与工程学报, 2000, 19(6): 775-779. (HU Zai-qiang, SHEN Zhu-jiang, XIE Ding-yi. Research on structure behavior of unsaturated loess[J]. Chinese Journal of Rock Mechanics and Engineering, 2000, 19(6): 775-779. (in Chinese))
[3]	PURI V K. Liquefaction behavior and dynamic properties of loessial (Silty) soils[D]. Missouri: University of Missouri-Rolla, 1984.
[4]	WANG Lan-min, HWANG H, LIN Y, et, al. Comparison of liquefaction of loess in China, USA and Russia[C]// Proc 4th International Conference on Recent Progress on Earthquake Engineering and Soil Dynamics. San Diego USA, 2001.
[5]	HWANG H, WANG Lan-min, YUAN Zhong-xia. Comparison of liquefaction potential of loess in Lanzhou, China, and Memphis, USA[J]. Soil Dynamics and Earthquake Engineering, 2000, 20: 389-395.
[6]	吴敏哲, 张柯, 胡卫兵, 等. 地铁行车荷载作用下饱和黄土的累积塑性应变[J]. 西安建筑科技大学学报 (自然科学版), 2011, 43(3): 316-322. (WU Min-zhe, ZHANG Ke, HU Wei-bing, et al. Cumulative plastic strain of saturated loess due to metro traffic loading[J]. Journal of Xi'an University of Architecture & Technology (Natural Science Edition), 2011, 43(3): 316-322. (in Chinese))
[7]	胡伟, 韩建刚. 结构性饱和黄土动力特性试验研究[J]. 工程地质学报, 2009, 17(5): 648-655. (HU Wei, HAN Jian-gang. Laboratory testing study of dynamic properties of saturated loess for effect of its internal structure[J]. Journal of Engineering Geology, 2009, 17(5): 648-655. (in Chinese))
[8]	佘跃心, 刘汉龙, 高玉峰. 饱和黄土孔压增长模式与液化机理的试验研究[J]. 岩土力学, 2002, 23(4): 395-399. (SHE Yue-xin, LIU Han-long, GAO Yu-feng. Study on liquefaction mechanism and pore water pressure mode of saturated original loess[J]. Rock and Soil Mechanics, 2002, 23(4): 395-399. (in Chinese))
[9]	孙海妹, 王兰民, 王平, 等. 饱和兰州黄土液化过程中孔压和应变发展的试验研究[J]. 岩土力学, 2010, 21(11): 3464-3468. (SUN Hai-mei, WANG Lan-min, WANG Ping, et al. Experimental study of development of strain and pore water pressure during liquefaction of saturated Lanzhou loess[J]. Rock and Soil Mechanics, 2010, 21(11): 3464-3468. (in Chinese))
[10]	王峻, 王兰民, 王平, 等. 不同地区饱和黄土液化特性研究[J]. 水文地质工程地质, 2011, 38(5): 54-56. (WANG Jun, WANG Lan-min, WANG Ping, et al. Study on liquefaction characters of saturated loess in different regions[J]. Hydrogeology & Engineering Geology, 2011, 38(5): 54-56. (in Chinese))
[11]	王谦, 王兰民, 王峻, 等. 基于密度控制理论的饱和黄土地基抗液化处理指标研究[J]. 岩土工程学报, 2013, 35(S2): 844-847. (WANG Qian, WANG Lan-min, WANG Jun, et al. Indices of anti-liquefaction treatment of saturated compacted loess foundation based on theory of density control[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(S2): 844-847. (in Chinese))
[12]	王永炎, 林在贯. 中国黄土的结构特征及物理力学性质[M]. 北京: 科学出版社, 1990. (WANG Yong-yan, LIN Zai-guan. The China loess structure features and its physical and mechanical properties[M]. Beijing: Science Press, 1990. (in Chinese))
[13]	邓津, 王兰民, 张振中, 等. 我国黄土的微结构类型与震陷区域划分[J]. 地震工程学报, 2013, 35(3): 664-670. (DENG Jin, WANG Lan-min, ZHANG Zheng-zhong, et al. The China loess microstructure types and its seismic subsidence zones divided[J]. China Earthquake Engineering Journal, 2013, 35(3): 664-670. (in Chinese))